David will be doing some work for me via Chad at CBRD- lots of long emails, I've got Chad organsing the mounting too.

will probably run a standard voltex front set up.

Considering flat panelling the entire car bottom with carbon panels..

 

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great write up man! i myself just got an APR splitter off a fellow EvoM member and a bumper from another. i plan on using them as an on/off assembly similar to yours. After the Brazilian Gran Prix i think i'm gonna get to work on test fitting them and possibly taking a test drive. hopefully i get some positive results!

 

EVOlutionary, are there any concerns of the rear diff getting too hot since the rear diffuser cover much of the rear diff. it's not a completely flat bottom car, so so air does get to it but not as much as normal.

 

I have not run into any issues, but I'll keep an eye on the diff fluid to see if it degrades more quickly than normal.

 

Bumping this up because I will be focusing on aero this off-season. Planning some changes to the car, which will involve the help of DHP.

EVOlutionary - This thread is back from 2011; have you changed anything else up regarding aero? Anymore DHP goodies?

I have Ryan Upham's old car, with the older version DHP wing. I plan on having them build me a similar diffuser, canards, and splitter. Unless I go with the Voltex track front bumper. What's your opinion on these options? Voltex vs DHP splitter?

 

I have my splitter and diffuser up for sale. I am moving onwards and upwards to something more radical along the lines of NEMO Evo or Tilton Interiors Evo from this year's WTAC. Building a completely new car from the ground up using the shell from my red Evo.

Looking at the Voltex front splitter/diffuser vs the DHP unit here are a couple thoughts:
- Voltex and DHP both have similar diffuser area and I would speculate similar downforce numbers. The full-race Voltex Cyber splitter that sticks out 6" on each side of the car would of course be expected to make more DF
- I removed the small Voltex canards. Seemed to create more drag than the DF benefit. I plan to have very large/wide canards on the new build.
- Voltex is a bit better finish and a direct bolt-up. The DHP is going to be a bit less $$ and you get to fabricate your own mounting setup. I made mine semi-quick detach to make it easier to get on/off the trailer. I didn't want to go through a 20 minute process every time I loaded/unloaded the car. . .

 

Thanks for all the info! PM'd you.

Looking forward to seeing your car transformed.

 

Ok I'm seeing lots of mixed results on what to do around the wheels. Do you try and block off any airflow in front of the tire? On many new factory cars, they put a little flap in front of the tires to decrease drag, but then on some cars you see some sort of diffuser in front of the tire like this:


Little flaps in front of the tire:




Sorry if this has already been talked about in this thread.

 

^ I think some people call them strakes. Makes the air go around the tires for better stability at high speed.

 

this is strictly from my research and i have no real world experience but...

i think the ramp up towards the tire is more useful, especially if you can add a few strakes to create some vortices to the air doesn't stick. the problem overeall is evacuating the mess of air from inside the wheel well. if you got serious you could work on louving the fender to evacuate it a little but because of the shape of our fenders i dont think you can get a great vertical placement. however, i think you could create a guard behind the wheel that would stop the air from exiting the wheel area and entering into the under car flow simply by creating a piece that angles in towards the center of the car from the back edge of the wheel well/front edge of the side skirt (if that makes any sense). that way you would have some flow straight in under the front splitter flowing into a central undisturbed channel while some is directed through a path out behind the wheel and may help evacuate the wheel well/create a barrier for air entering under the car.

purely me being obsess with this stuff in theory tho

you can see what im trying to say if yo ucan find pics of the 2011ish cyber evo flat floor. cant get to the pics while im at work tho.

 

The splitters that have diffusers built into them also vent the fenders. They also likely put more emphasis on down force than drag as dumping the air into the wheel well will increase drag. Venting the fender though lets the air out to make the diffuser more effective.

Using a diffuser like that without venting the fender probably adds a lot of drag with minimal gains in down force. If you have the HP to push through the drag (which these TA cars do have plenty of) then I'm sure the diffuser is extremely effective when done properly. If this is a 400 HP car though on a higher speed track, you might have better results trying to reduce drag in this area instead of trying to maximize down force.

 

I know this was asked earlier but has anyone had a answer on if the trans, tcase and rear diff fluids are cooking without the airflow.
Also what are people doing about jack points?

 

I have been satisfied using alumilite at $80 a sheet. Carbon fiber 4x8 panels cost over $1000. The alumilite is around 26lbs per sheet. Since using the side exhaust there have been no heat issues. The floor of the passenger footwell does gets hot but I have not recorded any interior temperatures yet. This year we hope to yarn the bottom and use a lipstick camera to record the airflow under the car. The tracks we will race on now are super smooth so we are planning to lower the car and increase spring rates to improve downforce. I should run slicks and take the hp hit. The corvette teams are starting to switch from A6 to slicks.

 

When I had my front splitter pass the front axles, I put a NACA duct just in front of the transfer case to get some air to it. Never did any temp logging in that area but I figured the cooling fins on the tcase needs some flowing air.